Jeremy Harmer is one of the most recognizable names in the field of ELT: a teacher-trainer, conference presenter and seminar leader, faculty member of the New School's MATESOL and a trustee of International House.

Leading author of The Practice of English Language Teaching and How to teach English, he is also general editor of the How to series for Longman Pearson. He's also an active musician and novelist. His twitter id is @harmerj

He is also widely known for his articles and instigating the practice of Dogme in the classroom. His most recent book, co-authored with Luke Meddings, is Teaching Unplugged. He tweets as @thornburyscott.

Other leading ELT authors who actively participate in the Blogosphere include:

Lindsay ClandfieldLindsay Clandfield is an English teacher, teacher trainer and writer. His first book, Dealing with Difficulties (DELTA, co-written with Luke Prodromou) won the Ben Warren International House prize and the Duke of Edinburgh Highly Commended award for books for teachers. He is also the author of The Language Teacher's Survival Handbook (iTs magazines, with Duncan Foord) and material for students including two coursebooks in the Straightforward series from Macmillan. His latest work is as main author for the new adult course Global, also published by Macmillan.

Lindsay is the blogger behind the site Six Things, a miscellany of ELT for teachers and enjoys making funny videos about the other VIPs on Twitter. You can follow his tweets at @lclandfield.

David CrystalDavid Crystal's authored works are mainly in the field of language, including several Penguin books, but he is perhaps best known for his two encyclopedias for Cambridge University Press, The Cambridge Encyclopedia of Language and The Cambridge Encyclopedia of the English Language. Recent books include By Hook or By Crook: a Journey in Search of English (2007) and Txtng: the Gr8 Db8 (2008).

Gavin DudeneyGavin Dudeney's blend of pedagogical and technical skills take him all over the world, primarily on behalf of International House and the British Council, helping teachers and schools bridge the gap between their training, teaching portfolio and technical needs. In 2003, he set up The Consultants-E with Nicky Hockly.

Publications include The Internet and the Language Classroom, CUP 2000 & 2007, the Ben Warren award winning book How to teach with technology (Pearson Longman 2007) with Nicky Hockly. Catch him on twitter at @dudeneyge

Vicki HollettVicky Hollett is an English teacher, trainer, conference presenter and course book writer for Oxford University Press and Pearson Longman. She has also lived in Japan and Algeria, delivered workshops for teachers in Europe, the Far East and South America. She currently teaches at the University of Pennsylvania and is particularly interested in pragmatics and socio-linguistics.

Popular publications include the best-selling In at the Deep End, Business Objectives and Business Opportunities, Tech Talk and the video & activity book, Meeting Objectives. She tweets at @vickihollett.